Finding the Fourth Proportional to 139,073.32, 191,913.15 and 81,703.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,073.32 : 191,913.15 = 81,703.72 : x
2. Step 2: Convert to fraction form
   139,073.32/191,913.15 = 81,703.72/x
3. Step 3: Cross multiply
   139,073.32x = 191,913.15 × 81,703.72
4. Step 4: Simplify right side
   139,073.32x = 15,680,018,271.92
5. Step 5: Solve for x
   x = 15,680,018,271.92/139,073.32
6. Step 6: Final answer
   x = 112,746.42