Finding the Fourth Proportional to 99,456.54, 149,198.55 and 31,990.47

Step by Step Solution

1. Step 1: Write the proportion equation
   99,456.54 : 149,198.55 = 31,990.47 : x
2. Step 2: Convert to fraction form
   99,456.54/149,198.55 = 31,990.47/x
3. Step 3: Cross multiply
   99,456.54x = 149,198.55 × 31,990.47
4. Step 4: Simplify right side
   99,456.54x = 4,772,931,737.82
5. Step 5: Solve for x
   x = 4,772,931,737.82/99,456.54
6. Step 6: Final answer
   x = 47,990.12