Finding the Fourth Proportional to 60,643.18, 90,490.47 and 54,339.05

Step by Step Solution

1. Step 1: Write the proportion equation
   60,643.18 : 90,490.47 = 54,339.05 : x
2. Step 2: Convert to fraction form
   60,643.18/90,490.47 = 54,339.05/x
3. Step 3: Cross multiply
   60,643.18x = 90,490.47 × 54,339.05
4. Step 4: Simplify right side
   60,643.18x = 4,917,166,196.31
5. Step 5: Solve for x
   x = 4,917,166,196.31/60,643.18
6. Step 6: Final answer
   x = 81,083.58