Finding the Fourth Proportional to 42,391.90, 63,597.98 and 12,810.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,391.90 : 63,597.98 = 12,810.03 : x
2. Step 2: Convert to fraction form
   42,391.90/63,597.98 = 12,810.03/x
3. Step 3: Cross multiply
   42,391.90x = 63,597.98 × 12,810.03
4. Step 4: Simplify right side
   42,391.90x = 814,692,031.74
5. Step 5: Solve for x
   x = 814,692,031.74/42,391.90
6. Step 6: Final answer
   x = 19,218.11