Finding the Fourth Proportional to 66,131.02, 91,337.79 and 55,414.72

Step by Step Solution

1. Step 1: Write the proportion equation
   66,131.02 : 91,337.79 = 55,414.72 : x
2. Step 2: Convert to fraction form
   66,131.02/91,337.79 = 55,414.72/x
3. Step 3: Cross multiply
   66,131.02x = 91,337.79 × 55,414.72
4. Step 4: Simplify right side
   66,131.02x = 5,061,458,058.27
5. Step 5: Solve for x
   x = 5,061,458,058.27/66,131.02
6. Step 6: Final answer
   x = 76,536.82