Finding the Fourth Proportional to 117,085.18, 161,467.88 and 77,724.55

Step by Step Solution

1. Step 1: Write the proportion equation
   117,085.18 : 161,467.88 = 77,724.55 : x
2. Step 2: Convert to fraction form
   117,085.18/161,467.88 = 77,724.55/x
3. Step 3: Cross multiply
   117,085.18x = 161,467.88 × 77,724.55
4. Step 4: Simplify right side
   117,085.18x = 12,550,017,654.61
5. Step 5: Solve for x
   x = 12,550,017,654.61/117,085.18
6. Step 6: Final answer
   x = 107,187.07