Finding the Fourth Proportional to 42,703.98, 64,064.20 and 13,116.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,703.98 : 64,064.20 = 13,116.56 : x
2. Step 2: Convert to fraction form
   42,703.98/64,064.20 = 13,116.56/x
3. Step 3: Cross multiply
   42,703.98x = 64,064.20 × 13,116.56
4. Step 4: Simplify right side
   42,703.98x = 840,301,923.15
5. Step 5: Solve for x
   x = 840,301,923.15/42,703.98
6. Step 6: Final answer
   x = 19,677.37