Finding the Fourth Proportional to 42,675.78, 64,012.80 and 13,092.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,675.78 : 64,012.80 = 13,092.96 : x
2. Step 2: Convert to fraction form
   42,675.78/64,012.80 = 13,092.96/x
3. Step 3: Cross multiply
   42,675.78x = 64,012.80 × 13,092.96
4. Step 4: Simplify right side
   42,675.78x = 838,117,029.89
5. Step 5: Solve for x
   x = 838,117,029.89/42,675.78
6. Step 6: Final answer
   x = 19,639.17