Finding the Fourth Proportional to 72,043.75, 99,431.90 and 42,235.75

Step by Step Solution

1. Step 1: Write the proportion equation
   72,043.75 : 99,431.90 = 42,235.75 : x
2. Step 2: Convert to fraction form
   72,043.75/99,431.90 = 42,235.75/x
3. Step 3: Cross multiply
   72,043.75x = 99,431.90 × 42,235.75
4. Step 4: Simplify right side
   72,043.75x = 4,199,580,659.25
5. Step 5: Solve for x
   x = 4,199,580,659.25/72,043.75
6. Step 6: Final answer
   x = 58,292.09