Finding the Fourth Proportional to 72,152.85, 99,570.67 and 40,321.74

Step by Step Solution

1. Step 1: Write the proportion equation
   72,152.85 : 99,570.67 = 40,321.74 : x
2. Step 2: Convert to fraction form
   72,152.85/99,570.67 = 40,321.74/x
3. Step 3: Cross multiply
   72,152.85x = 99,570.67 × 40,321.74
4. Step 4: Simplify right side
   72,152.85x = 4,014,862,667.37
5. Step 5: Solve for x
   x = 4,014,862,667.37/72,152.85
6. Step 6: Final answer
   x = 55,643.85