Finding the Fourth Proportional to 12,010.98, 18,017.12 and 4,991.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,010.98 : 18,017.12 = 4,991.70 : x
2. Step 2: Convert to fraction form
   12,010.98/18,017.12 = 4,991.70/x
3. Step 3: Cross multiply
   12,010.98x = 18,017.12 × 4,991.70
4. Step 4: Simplify right side
   12,010.98x = 89,936,002.82
5. Step 5: Solve for x
   x = 89,936,002.82/12,010.98
6. Step 6: Final answer
   x = 7,487.82