Finding the Fourth Proportional to 72,171.16, 99,588.06 and 40,339

Step by Step Solution

1. Step 1: Write the proportion equation
   72,171.16 : 99,588.06 = 40,339 : x
2. Step 2: Convert to fraction form
   72,171.16/99,588.06 = 40,339/x
3. Step 3: Cross multiply
   72,171.16x = 99,588.06 × 40,339
4. Step 4: Simplify right side
   72,171.16x = 4,017,282,752.34
5. Step 5: Solve for x
   x = 4,017,282,752.34/72,171.16
6. Step 6: Final answer
   x = 55,663.27