Finding the Fourth Proportional to 100,339.74, 138,470.18 and 55,017.61

Step by Step Solution

1. Step 1: Write the proportion equation
   100,339.74 : 138,470.18 = 55,017.61 : x
2. Step 2: Convert to fraction form
   100,339.74/138,470.18 = 55,017.61/x
3. Step 3: Cross multiply
   100,339.74x = 138,470.18 × 55,017.61
4. Step 4: Simplify right side
   100,339.74x = 7,618,297,392.43
5. Step 5: Solve for x
   x = 7,618,297,392.43/100,339.74
6. Step 6: Final answer
   x = 75,925.03