Finding the Fourth Proportional to 13,572.50, 18,731.42 and 7,830.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,572.50 : 18,731.42 = 7,830.16 : x
2. Step 2: Convert to fraction form
   13,572.50/18,731.42 = 7,830.16/x
3. Step 3: Cross multiply
   13,572.50x = 18,731.42 × 7,830.16
4. Step 4: Simplify right side
   13,572.50x = 146,670,015.63
5. Step 5: Solve for x
   x = 146,670,015.63/13,572.50
6. Step 6: Final answer
   x = 10,806.41