Finding the Fourth Proportional to 12,870.01, 19,305.21 and 5,078.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.01 : 19,305.21 = 5,078.75 : x
2. Step 2: Convert to fraction form
   12,870.01/19,305.21 = 5,078.75/x
3. Step 3: Cross multiply
   12,870.01x = 19,305.21 × 5,078.75
4. Step 4: Simplify right side
   12,870.01x = 98,046,335.29
5. Step 5: Solve for x
   x = 98,046,335.29/12,870.01
6. Step 6: Final answer
   x = 7,618.20