Finding the Fourth Proportional to 100,630.85, 138,870.69 and 55,308.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100,630.85 : 138,870.69 = 55,308.82 : x
2. Step 2: Convert to fraction form
   100,630.85/138,870.69 = 55,308.82/x
3. Step 3: Cross multiply
   100,630.85x = 138,870.69 × 55,308.82
4. Step 4: Simplify right side
   100,630.85x = 7,680,773,719.94
5. Step 5: Solve for x
   x = 7,680,773,719.94/100,630.85
6. Step 6: Final answer
   x = 76,326.23