Finding the Fourth Proportional to 12,904.71, 19,357.97 and 5,113.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.71 : 19,357.97 = 5,113.50 : x
2. Step 2: Convert to fraction form
   12,904.71/19,357.97 = 5,113.50/x
3. Step 3: Cross multiply
   12,904.71x = 19,357.97 × 5,113.50
4. Step 4: Simplify right side
   12,904.71x = 98,986,979.60
5. Step 5: Solve for x
   x = 98,986,979.60/12,904.71
6. Step 6: Final answer
   x = 7,670.61