Finding the Fourth Proportional to 8,988.95, 12,404.54 and 5,212.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,988.95 : 12,404.54 = 5,212.78 : x
2. Step 2: Convert to fraction form
   8,988.95/12,404.54 = 5,212.78/x
3. Step 3: Cross multiply
   8,988.95x = 12,404.54 × 5,212.78
4. Step 4: Simplify right side
   8,988.95x = 64,662,120.04
5. Step 5: Solve for x
   x = 64,662,120.04/8,988.95
6. Step 6: Final answer
   x = 7,193.51