Finding the Fourth Proportional to 12,931.09, 19,381.59 and 7,388.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.09 : 19,381.59 = 7,388.32 : x
2. Step 2: Convert to fraction form
   12,931.09/19,381.59 = 7,388.32/x
3. Step 3: Cross multiply
   12,931.09x = 19,381.59 × 7,388.32
4. Step 4: Simplify right side
   12,931.09x = 143,197,389.03
5. Step 5: Solve for x
   x = 143,197,389.03/12,931.09
6. Step 6: Final answer
   x = 11,073.88