Finding the Fourth Proportional to 66,438.63, 91,633.47 and 42,567.54

Step by Step Solution

1. Step 1: Write the proportion equation
   66,438.63 : 91,633.47 = 42,567.54 : x
2. Step 2: Convert to fraction form
   66,438.63/91,633.47 = 42,567.54/x
3. Step 3: Cross multiply
   66,438.63x = 91,633.47 × 42,567.54
4. Step 4: Simplify right side
   66,438.63x = 3,900,611,399.56
5. Step 5: Solve for x
   x = 3,900,611,399.56/66,438.63
6. Step 6: Final answer
   x = 58,709.99