Finding the Fourth Proportional to 288,875.31, 433,415.52 and 128,936.69

Step by Step Solution

1. Step 1: Write the proportion equation
   288,875.31 : 433,415.52 = 128,936.69 : x
2. Step 2: Convert to fraction form
   288,875.31/433,415.52 = 128,936.69/x
3. Step 3: Cross multiply
   288,875.31x = 433,415.52 × 128,936.69
4. Step 4: Simplify right side
   288,875.31x = 55,883,162,543.43
5. Step 5: Solve for x
   x = 55,883,162,543.43/288,875.31
6. Step 6: Final answer
   x = 193,450.81