Finding the Fourth Proportional to 42,700.47, 64,058.94 and 13,113.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,700.47 : 64,058.94 = 13,113.06 : x
2. Step 2: Convert to fraction form
   42,700.47/64,058.94 = 13,113.06/x
3. Step 3: Cross multiply
   42,700.47x = 64,058.94 × 13,113.06
4. Step 4: Simplify right side
   42,700.47x = 840,008,723.76
5. Step 5: Solve for x
   x = 840,008,723.76/42,700.47
6. Step 6: Final answer
   x = 19,672.12