Finding the Fourth Proportional to 72,442.61, 99,947.17 and 42,221.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,442.61 : 99,947.17 = 42,221.02 : x
2. Step 2: Convert to fraction form
   72,442.61/99,947.17 = 42,221.02/x
3. Step 3: Cross multiply
   72,442.61x = 99,947.17 × 42,221.02
4. Step 4: Simplify right side
   72,442.61x = 4,219,871,463.51
5. Step 5: Solve for x
   x = 4,219,871,463.51/72,442.61
6. Step 6: Final answer
   x = 58,251.23