Finding the Fourth Proportional to 85,538.55, 128,315 and 31,517.94

Step by Step Solution

1. Step 1: Write the proportion equation
   85,538.55 : 128,315 = 31,517.94 : x
2. Step 2: Convert to fraction form
   85,538.55/128,315 = 31,517.94/x
3. Step 3: Cross multiply
   85,538.55x = 128,315 × 31,517.94
4. Step 4: Simplify right side
   85,538.55x = 4,044,224,471.10
5. Step 5: Solve for x
   x = 4,044,224,471.10/85,538.55
6. Step 6: Final answer
   x = 47,279.55