Finding the Fourth Proportional to 116,068.50, 173,878.56 and 85,620

Step by Step Solution

1. Step 1: Write the proportion equation
   116,068.50 : 173,878.56 = 85,620 : x
2. Step 2: Convert to fraction form
   116,068.50/173,878.56 = 85,620/x
3. Step 3: Cross multiply
   116,068.50x = 173,878.56 × 85,620
4. Step 4: Simplify right side
   116,068.50x = 14,887,482,307.20
5. Step 5: Solve for x
   x = 14,887,482,307.20/116,068.50
6. Step 6: Final answer
   x = 128,264.62