Finding the Fourth Proportional to 89,702.10, 123,914.80 and 84,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89,702.10 : 123,914.80 = 84,978.18 : x
2. Step 2: Convert to fraction form
   89,702.10/123,914.80 = 84,978.18/x
3. Step 3: Cross multiply
   89,702.10x = 123,914.80 × 84,978.18
4. Step 4: Simplify right side
   89,702.10x = 10,530,053,347.04
5. Step 5: Solve for x
   x = 10,530,053,347.04/89,702.10
6. Step 6: Final answer
   x = 117,389.16