Finding the Fourth Proportional to 99,718.56, 149,418.72 and 69,789.60

Step by Step Solution

1. Step 1: Write the proportion equation
   99,718.56 : 149,418.72 = 69,789.60 : x
2. Step 2: Convert to fraction form
   99,718.56/149,418.72 = 69,789.60/x
3. Step 3: Cross multiply
   99,718.56x = 149,418.72 × 69,789.60
4. Step 4: Simplify right side
   99,718.56x = 10,427,872,701.31
5. Step 5: Solve for x
   x = 10,427,872,701.31/99,718.56
6. Step 6: Final answer
   x = 104,573.04