Finding the Fourth Proportional to 14,157.78, 19,538.13 and 7,870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   14,157.78 : 19,538.13 = 7,870.56 : x
2. Step 2: Convert to fraction form
   14,157.78/19,538.13 = 7,870.56/x
3. Step 3: Cross multiply
   14,157.78x = 19,538.13 × 7,870.56
4. Step 4: Simplify right side
   14,157.78x = 153,776,024.45
5. Step 5: Solve for x
   x = 153,776,024.45/14,157.78
6. Step 6: Final answer
   x = 10,861.59