Finding the Fourth Proportional to 91,800.90, 137,572.03 and 72,997.47

Step by Step Solution

1. Step 1: Write the proportion equation
   91,800.90 : 137,572.03 = 72,997.47 : x
2. Step 2: Convert to fraction form
   91,800.90/137,572.03 = 72,997.47/x
3. Step 3: Cross multiply
   91,800.90x = 137,572.03 × 72,997.47
4. Step 4: Simplify right side
   91,800.90x = 10,042,410,132.76
5. Step 5: Solve for x
   x = 10,042,410,132.76/91,800.90
6. Step 6: Final answer
   x = 109,393.37