Finding the Fourth Proportional to 66,435.72, 91,771.02 and 53,100.42

Step by Step Solution

1. Step 1: Write the proportion equation
   66,435.72 : 91,771.02 = 53,100.42 : x
2. Step 2: Convert to fraction form
   66,435.72/91,771.02 = 53,100.42/x
3. Step 3: Cross multiply
   66,435.72x = 91,771.02 × 53,100.42
4. Step 4: Simplify right side
   66,435.72x = 4,873,079,705.83
5. Step 5: Solve for x
   x = 4,873,079,705.83/66,435.72
6. Step 6: Final answer
   x = 73,350.30