Finding the Fourth Proportional to 38,510.93, 53,139.83 and 21,513.07

Step by Step Solution

1. Step 1: Write the proportion equation
   38,510.93 : 53,139.83 = 21,513.07 : x
2. Step 2: Convert to fraction form
   38,510.93/53,139.83 = 21,513.07/x
3. Step 3: Cross multiply
   38,510.93x = 53,139.83 × 21,513.07
4. Step 4: Simplify right side
   38,510.93x = 1,143,200,882.58
5. Step 5: Solve for x
   x = 1,143,200,882.58/38,510.93
6. Step 6: Final answer
   x = 29,685.10