Finding the Fourth Proportional to 100,504.46, 138,697.98 and 55,186.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,504.46 : 138,697.98 = 55,186.72 : x
2. Step 2: Convert to fraction form
   100,504.46/138,697.98 = 55,186.72/x
3. Step 3: Cross multiply
   100,504.46x = 138,697.98 × 55,186.72
4. Step 4: Simplify right side
   100,504.46x = 7,654,286,586.83
5. Step 5: Solve for x
   x = 7,654,286,586.83/100,504.46
6. Step 6: Final answer
   x = 76,158.68