Finding the Fourth Proportional to 12,880.31, 19,307.40 and 7,322.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,880.31 : 19,307.40 = 7,322.17 : x
2. Step 2: Convert to fraction form
   12,880.31/19,307.40 = 7,322.17/x
3. Step 3: Cross multiply
   12,880.31x = 19,307.40 × 7,322.17
4. Step 4: Simplify right side
   12,880.31x = 141,372,095.02
5. Step 5: Solve for x
   x = 141,372,095.02/12,880.31
6. Step 6: Final answer
   x = 10,975.83