Finding the Fourth Proportional to 66,548.59, 91,878.50 and 42,363.20

Step by Step Solution

1. Step 1: Write the proportion equation
   66,548.59 : 91,878.50 = 42,363.20 : x
2. Step 2: Convert to fraction form
   66,548.59/91,878.50 = 42,363.20/x
3. Step 3: Cross multiply
   66,548.59x = 91,878.50 × 42,363.20
4. Step 4: Simplify right side
   66,548.59x = 3,892,267,606.80
5. Step 5: Solve for x
   x = 3,892,267,606.80/66,548.59
6. Step 6: Final answer
   x = 58,487.61