Finding the Fourth Proportional to 139,104.65, 191,893.77 and 88,031.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,104.65 : 191,893.77 = 88,031.31 : x
2. Step 2: Convert to fraction form
   139,104.65/191,893.77 = 88,031.31/x
3. Step 3: Cross multiply
   139,104.65x = 191,893.77 × 88,031.31
4. Step 4: Simplify right side
   139,104.65x = 16,892,659,953.94
5. Step 5: Solve for x
   x = 16,892,659,953.94/139,104.65
6. Step 6: Final answer
   x = 121,438.50