Finding the Fourth Proportional to 109,139.40, 150,610.86 and 61,392.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109,139.40 : 150,610.86 = 61,392.72 : x
2. Step 2: Convert to fraction form
   109,139.40/150,610.86 = 61,392.72/x
3. Step 3: Cross multiply
   109,139.40x = 150,610.86 × 61,392.72
4. Step 4: Simplify right side
   109,139.40x = 9,246,410,356.94
5. Step 5: Solve for x
   x = 9,246,410,356.94/109,139.40
6. Step 6: Final answer
   x = 84,721.10