Finding the Fourth Proportional to 139,072.32, 191,911.77 and 81,702.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,072.32 : 191,911.77 = 81,702.72 : x
2. Step 2: Convert to fraction form
   139,072.32/191,911.77 = 81,702.72/x
3. Step 3: Cross multiply
   139,072.32x = 191,911.77 × 81,702.72
4. Step 4: Simplify right side
   139,072.32x = 15,679,713,609.01
5. Step 5: Solve for x
   x = 15,679,713,609.01/139,072.32
6. Step 6: Final answer
   x = 112,745.04