Finding the Fourth Proportional to 9,410.89, 12,987.05 and 5,161.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.89 : 12,987.05 = 5,161.99 : x
2. Step 2: Convert to fraction form
   9,410.89/12,987.05 = 5,161.99/x
3. Step 3: Cross multiply
   9,410.89x = 12,987.05 × 5,161.99
4. Step 4: Simplify right side
   9,410.89x = 67,038,963.95
5. Step 5: Solve for x
   x = 67,038,963.95/9,410.89
6. Step 6: Final answer
   x = 7,123.55