Finding the Fourth Proportional to 128,973.94, 177,984.03 and 72,385.31

Step by Step Solution

1. Step 1: Write the proportion equation
   128,973.94 : 177,984.03 = 72,385.31 : x
2. Step 2: Convert to fraction form
   128,973.94/177,984.03 = 72,385.31/x
3. Step 3: Cross multiply
   128,973.94x = 177,984.03 × 72,385.31
4. Step 4: Simplify right side
   128,973.94x = 12,883,429,903.00
5. Step 5: Solve for x
   x = 12,883,429,903.00/128,973.94
6. Step 6: Final answer
   x = 99,891.73