Finding the Fourth Proportional to 100,742.42, 139,024.80 and 55,425.02

Step by Step Solution

1. Step 1: Write the proportion equation
   100,742.42 : 139,024.80 = 55,425.02 : x
2. Step 2: Convert to fraction form
   100,742.42/139,024.80 = 55,425.02/x
3. Step 3: Cross multiply
   100,742.42x = 139,024.80 × 55,425.02
4. Step 4: Simplify right side
   100,742.42x = 7,705,452,320.50
5. Step 5: Solve for x
   x = 7,705,452,320.50/100,742.42
6. Step 6: Final answer
   x = 76,486.67