Finding the Fourth Proportional to 42,428.12, 63,645.38 and 12,848.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,428.12 : 63,645.38 = 12,848.34 : x
2. Step 2: Convert to fraction form
   42,428.12/63,645.38 = 12,848.34/x
3. Step 3: Cross multiply
   42,428.12x = 63,645.38 × 12,848.34
4. Step 4: Simplify right side
   42,428.12x = 817,737,417.43
5. Step 5: Solve for x
   x = 817,737,417.43/42,428.12
6. Step 6: Final answer
   x = 19,273.48