Finding the Fourth Proportional to 128,625, 177,502.54 and 72,036.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128,625 : 177,502.54 = 72,036.38 : x
2. Step 2: Convert to fraction form
   128,625/177,502.54 = 72,036.38/x
3. Step 3: Cross multiply
   128,625x = 177,502.54 × 72,036.38
4. Step 4: Simplify right side
   128,625x = 12,786,640,422.41
5. Step 5: Solve for x
   x = 12,786,640,422.41/128,625
6. Step 6: Final answer
   x = 99,410.23