Finding the Fourth Proportional to 128,915.34, 177,863.28 and 75,162.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,915.34 : 177,863.28 = 75,162.30 : x
2. Step 2: Convert to fraction form
   128,915.34/177,863.28 = 75,162.30/x
3. Step 3: Cross multiply
   128,915.34x = 177,863.28 × 75,162.30
4. Step 4: Simplify right side
   128,915.34x = 13,368,613,210.34
5. Step 5: Solve for x
   x = 13,368,613,210.34/128,915.34
6. Step 6: Final answer
   x = 103,700.72