Finding the Fourth Proportional to 128,903.31, 177,846.71 and 75,150.29

Step by Step Solution

1. Step 1: Write the proportion equation
   128,903.31 : 177,846.71 = 75,150.29 : x
2. Step 2: Convert to fraction form
   128,903.31/177,846.71 = 75,150.29/x
3. Step 3: Cross multiply
   128,903.31x = 177,846.71 × 75,150.29
4. Step 4: Simplify right side
   128,903.31x = 13,365,231,900.91
5. Step 5: Solve for x
   x = 13,365,231,900.91/128,903.31
6. Step 6: Final answer
   x = 103,684.16