Finding the Fourth Proportional to 99,618.30, 137,648.25 and 79,640.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,618.30 : 137,648.25 = 79,640.10 : x
2. Step 2: Convert to fraction form
   99,618.30/137,648.25 = 79,640.10/x
3. Step 3: Cross multiply
   99,618.30x = 137,648.25 × 79,640.10
4. Step 4: Simplify right side
   99,618.30x = 10,962,320,394.83
5. Step 5: Solve for x
   x = 10,962,320,394.83/99,618.30
6. Step 6: Final answer
   x = 110,043.24