Finding the Fourth Proportional to 11,381.60, 15,700.42 and 7,131.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,381.60 : 15,700.42 = 7,131.76 : x
2. Step 2: Convert to fraction form
   11,381.60/15,700.42 = 7,131.76/x
3. Step 3: Cross multiply
   11,381.60x = 15,700.42 × 7,131.76
4. Step 4: Simplify right side
   11,381.60x = 111,971,627.34
5. Step 5: Solve for x
   x = 111,971,627.34/11,381.60
6. Step 6: Final answer
   x = 9,837.95