Finding the Fourth Proportional to 100,611, 138,843.72 and 55,899

Step by Step Solution

1. Step 1: Write the proportion equation
   100,611 : 138,843.72 = 55,899 : x
2. Step 2: Convert to fraction form
   100,611/138,843.72 = 55,899/x
3. Step 3: Cross multiply
   100,611x = 138,843.72 × 55,899
4. Step 4: Simplify right side
   100,611x = 7,761,225,104.28
5. Step 5: Solve for x
   x = 7,761,225,104.28/100,611
6. Step 6: Final answer
   x = 77,140.92