Finding the Fourth Proportional to 233,107,200.12, 321,688,963.56 and 128,686,129.50

Step by Step Solution

1. Step 1: Write the proportion equation
   233,107,200.12 : 321,688,963.56 = 128,686,129.50 : x
2. Step 2: Convert to fraction form
   233,107,200.12/321,688,963.56 = 128,686,129.50/x
3. Step 3: Cross multiply
   233,107,200.12x = 321,688,963.56 × 128,686,129.50
4. Step 4: Simplify right side
   233,107,200.12x = 41,396,907,623,402,944
5. Step 5: Solve for x
   x = 41,396,907,623,402,944/233,107,200.12
6. Step 6: Final answer
   x = 177,587,425.88