Finding the Fourth Proportional to 100,499, 138,690.24 and 55,787

Step by Step Solution

1. Step 1: Write the proportion equation
   100,499 : 138,690.24 = 55,787 : x
2. Step 2: Convert to fraction form
   100,499/138,690.24 = 55,787/x
3. Step 3: Cross multiply
   100,499x = 138,690.24 × 55,787
4. Step 4: Simplify right side
   100,499x = 7,737,112,418.88
5. Step 5: Solve for x
   x = 7,737,112,418.88/100,499
6. Step 6: Final answer
   x = 76,986.96