Finding the Fourth Proportional to 100,782.79, 139,076.75 and 55,456.53

Step by Step Solution

1. Step 1: Write the proportion equation
   100,782.79 : 139,076.75 = 55,456.53 : x
2. Step 2: Convert to fraction form
   100,782.79/139,076.75 = 55,456.53/x
3. Step 3: Cross multiply
   100,782.79x = 139,076.75 × 55,456.53
4. Step 4: Simplify right side
   100,782.79x = 7,712,713,575.78
5. Step 5: Solve for x
   x = 7,712,713,575.78/100,782.79
6. Step 6: Final answer
   x = 76,528.08