Finding the Fourth Proportional to 139,902.88, 193,031.76 and 89,669.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,902.88 : 193,031.76 = 89,669.92 : x
2. Step 2: Convert to fraction form
   139,902.88/193,031.76 = 89,669.92/x
3. Step 3: Cross multiply
   139,902.88x = 193,031.76 × 89,669.92
4. Step 4: Simplify right side
   139,902.88x = 17,309,142,476.66
5. Step 5: Solve for x
   x = 17,309,142,476.66/139,902.88
6. Step 6: Final answer
   x = 123,722.56