Finding the Fourth Proportional to 66,436.72, 91,772.40 and 53,101.42

Step by Step Solution

1. Step 1: Write the proportion equation
   66,436.72 : 91,772.40 = 53,101.42 : x
2. Step 2: Convert to fraction form
   66,436.72/91,772.40 = 53,101.42/x
3. Step 3: Cross multiply
   66,436.72x = 91,772.40 × 53,101.42
4. Step 4: Simplify right side
   66,436.72x = 4,873,244,756.81
5. Step 5: Solve for x
   x = 4,873,244,756.81/66,436.72
6. Step 6: Final answer
   x = 73,351.68