Finding the Fourth Proportional to 72,212.31, 99,654.30 and 40,380.53

Step by Step Solution

1. Step 1: Write the proportion equation
   72,212.31 : 99,654.30 = 40,380.53 : x
2. Step 2: Convert to fraction form
   72,212.31/99,654.30 = 40,380.53/x
3. Step 3: Cross multiply
   72,212.31x = 99,654.30 × 40,380.53
4. Step 4: Simplify right side
   72,212.31x = 4,024,092,952.51
5. Step 5: Solve for x
   x = 4,024,092,952.51/72,212.31
6. Step 6: Final answer
   x = 55,725.86