Finding the Fourth Proportional to 91,100.16, 136,615.68 and 31,921.92

Step by Step Solution

1. Step 1: Write the proportion equation
   91,100.16 : 136,615.68 = 31,921.92 : x
2. Step 2: Convert to fraction form
   91,100.16/136,615.68 = 31,921.92/x
3. Step 3: Cross multiply
   91,100.16x = 136,615.68 × 31,921.92
4. Step 4: Simplify right side
   91,100.16x = 4,361,034,807.71
5. Step 5: Solve for x
   x = 4,361,034,807.71/91,100.16
6. Step 6: Final answer
   x = 47,870.77