Finding the Fourth Proportional to 78,012.66, 107,657.52 and 42,202.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,012.66 : 107,657.52 = 42,202.56 : x
2. Step 2: Convert to fraction form
   78,012.66/107,657.52 = 42,202.56/x
3. Step 3: Cross multiply
   78,012.66x = 107,657.52 × 42,202.56
4. Step 4: Simplify right side
   78,012.66x = 4,543,422,947.25
5. Step 5: Solve for x
   x = 4,543,422,947.25/78,012.66
6. Step 6: Final answer
   x = 58,239.56