Finding the Fourth Proportional to 9,410.84, 12,988.34 and 5,431.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.84 : 12,988.34 = 5,431.16 : x
2. Step 2: Convert to fraction form
   9,410.84/12,988.34 = 5,431.16/x
3. Step 3: Cross multiply
   9,410.84x = 12,988.34 × 5,431.16
4. Step 4: Simplify right side
   9,410.84x = 70,541,752.67
5. Step 5: Solve for x
   x = 70,541,752.67/9,410.84
6. Step 6: Final answer
   x = 7,495.80