Finding the Fourth Proportional to 100,753.74, 139,040.15 and 55,430.74

Step by Step Solution

1. Step 1: Write the proportion equation
   100,753.74 : 139,040.15 = 55,430.74 : x
2. Step 2: Convert to fraction form
   100,753.74/139,040.15 = 55,430.74/x
3. Step 3: Cross multiply
   100,753.74x = 139,040.15 × 55,430.74
4. Step 4: Simplify right side
   100,753.74x = 7,707,098,300.86
5. Step 5: Solve for x
   x = 7,707,098,300.86/100,753.74
6. Step 6: Final answer
   x = 76,494.41