Finding the Fourth Proportional to 72,400.76, 99,915.84 and 42,205.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,400.76 : 99,915.84 = 42,205.56 : x
2. Step 2: Convert to fraction form
   72,400.76/99,915.84 = 42,205.56/x
3. Step 3: Cross multiply
   72,400.76x = 99,915.84 × 42,205.56
4. Step 4: Simplify right side
   72,400.76x = 4,217,003,980.07
5. Step 5: Solve for x
   x = 4,217,003,980.07/72,400.76
6. Step 6: Final answer
   x = 58,245.30