Finding the Fourth Proportional to 91,298.38, 126,026.88 and 81,721.34

Step by Step Solution

1. Step 1: Write the proportion equation
   91,298.38 : 126,026.88 = 81,721.34 : x
2. Step 2: Convert to fraction form
   91,298.38/126,026.88 = 81,721.34/x
3. Step 3: Cross multiply
   91,298.38x = 126,026.88 × 81,721.34
4. Step 4: Simplify right side
   91,298.38x = 10,299,085,509.62
5. Step 5: Solve for x
   x = 10,299,085,509.62/91,298.38
6. Step 6: Final answer
   x = 112,806.88