Finding the Fourth Proportional to 66,498.50, 91,781.59 and 40,661.47

Step by Step Solution

1. Step 1: Write the proportion equation
   66,498.50 : 91,781.59 = 40,661.47 : x
2. Step 2: Convert to fraction form
   66,498.50/91,781.59 = 40,661.47/x
3. Step 3: Cross multiply
   66,498.50x = 91,781.59 × 40,661.47
4. Step 4: Simplify right side
   66,498.50x = 3,731,974,189.71
5. Step 5: Solve for x
   x = 3,731,974,189.71/66,498.50
6. Step 6: Final answer
   x = 56,121.18