Finding the Fourth Proportional to 42,462.10, 63,676.95 and 12,870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,462.10 : 63,676.95 = 12,870.10 : x
2. Step 2: Convert to fraction form
   42,462.10/63,676.95 = 12,870.10/x
3. Step 3: Cross multiply
   42,462.10x = 63,676.95 × 12,870.10
4. Step 4: Simplify right side
   42,462.10x = 819,528,714.20
5. Step 5: Solve for x
   x = 819,528,714.20/42,462.10
6. Step 6: Final answer
   x = 19,300.24