Finding the Fourth Proportional to 100,485.07, 138,670.72 and 55,156.46

Step by Step Solution

1. Step 1: Write the proportion equation
   100,485.07 : 138,670.72 = 55,156.46 : x
2. Step 2: Convert to fraction form
   100,485.07/138,670.72 = 55,156.46/x
3. Step 3: Cross multiply
   100,485.07x = 138,670.72 × 55,156.46
4. Step 4: Simplify right side
   100,485.07x = 7,648,585,189.61
5. Step 5: Solve for x
   x = 7,648,585,189.61/100,485.07
6. Step 6: Final answer
   x = 76,116.63