Finding the Fourth Proportional to 28,275.42, 42,406.65 and 12,697.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,275.42 : 42,406.65 = 12,697.50 : x
2. Step 2: Convert to fraction form
   28,275.42/42,406.65 = 12,697.50/x
3. Step 3: Cross multiply
   28,275.42x = 42,406.65 × 12,697.50
4. Step 4: Simplify right side
   28,275.42x = 538,458,438.38
5. Step 5: Solve for x
   x = 538,458,438.38/28,275.42
6. Step 6: Final answer
   x = 19,043.34