Finding the Fourth Proportional to 42,279.10, 63,428.38 and 12,697.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,279.10 : 63,428.38 = 12,697.49 : x
2. Step 2: Convert to fraction form
   42,279.10/63,428.38 = 12,697.49/x
3. Step 3: Cross multiply
   42,279.10x = 63,428.38 × 12,697.49
4. Step 4: Simplify right side
   42,279.10x = 805,381,347.59
5. Step 5: Solve for x
   x = 805,381,347.59/42,279.10
6. Step 6: Final answer
   x = 19,049.16