Finding the Fourth Proportional to 8,991.45, 12,407.72 and 5,012.87

Step by Step Solution

1. Step 1: Write the proportion equation
   8,991.45 : 12,407.72 = 5,012.87 : x
2. Step 2: Convert to fraction form
   8,991.45/12,407.72 = 5,012.87/x
3. Step 3: Cross multiply
   8,991.45x = 12,407.72 × 5,012.87
4. Step 4: Simplify right side
   8,991.45x = 62,198,200.25
5. Step 5: Solve for x
   x = 62,198,200.25/8,991.45
6. Step 6: Final answer
   x = 6,917.48