Finding the Fourth Proportional to 10,602.15, 15,870.83 and 10,602.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,602.15 : 15,870.83 = 10,602.15 : x
2. Step 2: Convert to fraction form
   10,602.15/15,870.83 = 10,602.15/x
3. Step 3: Cross multiply
   10,602.15x = 15,870.83 × 10,602.15
4. Step 4: Simplify right side
   10,602.15x = 168,264,867.27
5. Step 5: Solve for x
   x = 168,264,867.27/10,602.15
6. Step 6: Final answer
   x = 15,870.83