Finding the Fourth Proportional to 72,158.56, 99,570.19 and 39,888.83

Step by Step Solution

1. Step 1: Write the proportion equation
   72,158.56 : 99,570.19 = 39,888.83 : x
2. Step 2: Convert to fraction form
   72,158.56/99,570.19 = 39,888.83/x
3. Step 3: Cross multiply
   72,158.56x = 99,570.19 × 39,888.83
4. Step 4: Simplify right side
   72,158.56x = 3,971,738,381.98
5. Step 5: Solve for x
   x = 3,971,738,381.98/72,158.56
6. Step 6: Final answer
   x = 55,041.82