Finding the Fourth Proportional to 42,669.02, 64,003.80 and 13,086.74

Step by Step Solution

1. Step 1: Write the proportion equation
   42,669.02 : 64,003.80 = 13,086.74 : x
2. Step 2: Convert to fraction form
   42,669.02/64,003.80 = 13,086.74/x
3. Step 3: Cross multiply
   42,669.02x = 64,003.80 × 13,086.74
4. Step 4: Simplify right side
   42,669.02x = 837,601,089.61
5. Step 5: Solve for x
   x = 837,601,089.61/42,669.02
6. Step 6: Final answer
   x = 19,630.19