Finding the Fourth Proportional to 266,128.12, 399,105.78 and 88,587.46

Step by Step Solution

1. Step 1: Write the proportion equation
   266,128.12 : 399,105.78 = 88,587.46 : x
2. Step 2: Convert to fraction form
   266,128.12/399,105.78 = 88,587.46/x
3. Step 3: Cross multiply
   266,128.12x = 399,105.78 × 88,587.46
4. Step 4: Simplify right side
   266,128.12x = 35,355,767,321.52
5. Step 5: Solve for x
   x = 35,355,767,321.52/266,128.12
6. Step 6: Final answer
   x = 132,852.43