Finding the Fourth Proportional to 21,478.42, 29,572.86 and 19,510.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,478.42 : 29,572.86 = 19,510.12 : x
2. Step 2: Convert to fraction form
   21,478.42/29,572.86 = 19,510.12/x
3. Step 3: Cross multiply
   21,478.42x = 29,572.86 × 19,510.12
4. Step 4: Simplify right side
   21,478.42x = 576,970,047.34
5. Step 5: Solve for x
   x = 576,970,047.34/21,478.42
6. Step 6: Final answer
   x = 26,862.78