Finding the Fourth Proportional to 11,505, 15,870.42 and 7,525.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,505 : 15,870.42 = 7,525.20 : x
2. Step 2: Convert to fraction form
   11,505/15,870.42 = 7,525.20/x
3. Step 3: Cross multiply
   11,505x = 15,870.42 × 7,525.20
4. Step 4: Simplify right side
   11,505x = 119,428,084.58
5. Step 5: Solve for x
   x = 119,428,084.58/11,505
6. Step 6: Final answer
   x = 10,380.54