Finding the Fourth Proportional to 42,402.30, 63,593.73 and 12,820.02

Step by Step Solution

1. Step 1: Write the proportion equation
   42,402.30 : 63,593.73 = 12,820.02 : x
2. Step 2: Convert to fraction form
   42,402.30/63,593.73 = 12,820.02/x
3. Step 3: Cross multiply
   42,402.30x = 63,593.73 × 12,820.02
4. Step 4: Simplify right side
   42,402.30x = 815,272,890.47
5. Step 5: Solve for x
   x = 815,272,890.47/42,402.30
6. Step 6: Final answer
   x = 19,227.09