Finding the Fourth Proportional to 61,290.62, 91,961.46 and 31,715.10

Step by Step Solution

1. Step 1: Write the proportion equation
   61,290.62 : 91,961.46 = 31,715.10 : x
2. Step 2: Convert to fraction form
   61,290.62/91,961.46 = 31,715.10/x
3. Step 3: Cross multiply
   61,290.62x = 91,961.46 × 31,715.10
4. Step 4: Simplify right side
   61,290.62x = 2,916,566,900.05
5. Step 5: Solve for x
   x = 2,916,566,900.05/61,290.62
6. Step 6: Final answer
   x = 47,585.86