Finding the Fourth Proportional to 12,870.60, 19,302.66 and 5,079.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.60 : 19,302.66 = 5,079.48 : x
2. Step 2: Convert to fraction form
   12,870.60/19,302.66 = 5,079.48/x
3. Step 3: Cross multiply
   12,870.60x = 19,302.66 × 5,079.48
4. Step 4: Simplify right side
   12,870.60x = 98,047,475.42
5. Step 5: Solve for x
   x = 98,047,475.42/12,870.60
6. Step 6: Final answer
   x = 7,617.94