Finding the Fourth Proportional to 28,139.59, 42,196.32 and 10,365.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,139.59 : 42,196.32 = 10,365.76 : x
2. Step 2: Convert to fraction form
   28,139.59/42,196.32 = 10,365.76/x
3. Step 3: Cross multiply
   28,139.59x = 42,196.32 × 10,365.76
4. Step 4: Simplify right side
   28,139.59x = 437,396,926.00
5. Step 5: Solve for x
   x = 437,396,926.00/28,139.59
6. Step 6: Final answer
   x = 15,543.83