Finding the Fourth Proportional to 13,328.86, 19,979.91 and 4,557.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,328.86 : 19,979.91 = 4,557.78 : x
2. Step 2: Convert to fraction form
   13,328.86/19,979.91 = 4,557.78/x
3. Step 3: Cross multiply
   13,328.86x = 19,979.91 × 4,557.78
4. Step 4: Simplify right side
   13,328.86x = 91,064,034.20
5. Step 5: Solve for x
   x = 91,064,034.20/13,328.86
6. Step 6: Final answer
   x = 6,832.09