Finding the Fourth Proportional to 28,055.16, 42,071.76 and 10,515.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,055.16 : 42,071.76 = 10,515.42 : x
2. Step 2: Convert to fraction form
   28,055.16/42,071.76 = 10,515.42/x
3. Step 3: Cross multiply
   28,055.16x = 42,071.76 × 10,515.42
4. Step 4: Simplify right side
   28,055.16x = 442,402,226.54
5. Step 5: Solve for x
   x = 442,402,226.54/28,055.16
6. Step 6: Final answer
   x = 15,769.01