Finding the Fourth Proportional to 138,456, 191,069.28 and 78,851.52

Step by Step Solution

1. Step 1: Write the proportion equation
   138,456 : 191,069.28 = 78,851.52 : x
2. Step 2: Convert to fraction form
   138,456/191,069.28 = 78,851.52/x
3. Step 3: Cross multiply
   138,456x = 191,069.28 × 78,851.52
4. Step 4: Simplify right side
   138,456x = 15,066,103,153.31
5. Step 5: Solve for x
   x = 15,066,103,153.31/138,456
6. Step 6: Final answer
   x = 108,815.10