Finding the Fourth Proportional to 78,678.67, 108,575.20 and 42,868.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78,678.67 : 108,575.20 = 42,868.98 : x
2. Step 2: Convert to fraction form
   78,678.67/108,575.20 = 42,868.98/x
3. Step 3: Cross multiply
   78,678.67x = 108,575.20 × 42,868.98
4. Step 4: Simplify right side
   78,678.67x = 4,654,507,427.25
5. Step 5: Solve for x
   x = 4,654,507,427.25/78,678.67
6. Step 6: Final answer
   x = 59,158.44