Finding the Fourth Proportional to 218,969.59, 328,603.43 and 78,742.39

Step by Step Solution

1. Step 1: Write the proportion equation
   218,969.59 : 328,603.43 = 78,742.39 : x
2. Step 2: Convert to fraction form
   218,969.59/328,603.43 = 78,742.39/x
3. Step 3: Cross multiply
   218,969.59x = 328,603.43 × 78,742.39
4. Step 4: Simplify right side
   218,969.59x = 25,875,019,046.69
5. Step 5: Solve for x
   x = 25,875,019,046.69/218,969.59
6. Step 6: Final answer
   x = 118,167.18