Finding the Fourth Proportional to 42,706.71, 64,066.20 and 13,127.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,706.71 : 64,066.20 = 13,127.03 : x
2. Step 2: Convert to fraction form
   42,706.71/64,066.20 = 13,127.03/x
3. Step 3: Cross multiply
   42,706.71x = 64,066.20 × 13,127.03
4. Step 4: Simplify right side
   42,706.71x = 840,999,040.33
5. Step 5: Solve for x
   x = 840,999,040.33/42,706.71
6. Step 6: Final answer
   x = 19,692.43