Finding the Fourth Proportional to 8,985.96, 12,401.28 and 5,210.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,985.96 : 12,401.28 = 5,210.10 : x
2. Step 2: Convert to fraction form
   8,985.96/12,401.28 = 5,210.10/x
3. Step 3: Cross multiply
   8,985.96x = 12,401.28 × 5,210.10
4. Step 4: Simplify right side
   8,985.96x = 64,611,908.93
5. Step 5: Solve for x
   x = 64,611,908.93/8,985.96
6. Step 6: Final answer
   x = 7,190.32