Finding the Fourth Proportional to 12,572.84, 18,851.86 and 4,782.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,572.84 : 18,851.86 = 4,782.20 : x
2. Step 2: Convert to fraction form
   12,572.84/18,851.86 = 4,782.20/x
3. Step 3: Cross multiply
   12,572.84x = 18,851.86 × 4,782.20
4. Step 4: Simplify right side
   12,572.84x = 90,153,364.89
5. Step 5: Solve for x
   x = 90,153,364.89/12,572.84
6. Step 6: Final answer
   x = 7,170.49