Finding the Fourth Proportional to 108,978.30, 163,402.65 and 56,490.30

Step by Step Solution

1. Step 1: Write the proportion equation
   108,978.30 : 163,402.65 = 56,490.30 : x
2. Step 2: Convert to fraction form
   108,978.30/163,402.65 = 56,490.30/x
3. Step 3: Cross multiply
   108,978.30x = 163,402.65 × 56,490.30
4. Step 4: Simplify right side
   108,978.30x = 9,230,664,719.30
5. Step 5: Solve for x
   x = 9,230,664,719.30/108,978.30
6. Step 6: Final answer
   x = 84,701.86