Finding the Fourth Proportional to 90,891.47, 136,399.49 and 31,727.15

Step by Step Solution

1. Step 1: Write the proportion equation
   90,891.47 : 136,399.49 = 31,727.15 : x
2. Step 2: Convert to fraction form
   90,891.47/136,399.49 = 31,727.15/x
3. Step 3: Cross multiply
   90,891.47x = 136,399.49 × 31,727.15
4. Step 4: Simplify right side
   90,891.47x = 4,327,567,499.47
5. Step 5: Solve for x
   x = 4,327,567,499.47/90,891.47
6. Step 6: Final answer
   x = 47,612.47