Finding the Fourth Proportional to 66,438.64, 91,633.46 and 42,567.54

Step by Step Solution

1. Step 1: Write the proportion equation
   66,438.64 : 91,633.46 = 42,567.54 : x
2. Step 2: Convert to fraction form
   66,438.64/91,633.46 = 42,567.54/x
3. Step 3: Cross multiply
   66,438.64x = 91,633.46 × 42,567.54
4. Step 4: Simplify right side
   66,438.64x = 3,900,610,973.89
5. Step 5: Solve for x
   x = 3,900,610,973.89/66,438.64
6. Step 6: Final answer
   x = 58,709.98