Finding the Fourth Proportional to 78,389.74, 108,178.64 and 42,580.45

Step by Step Solution

1. Step 1: Write the proportion equation
   78,389.74 : 108,178.64 = 42,580.45 : x
2. Step 2: Convert to fraction form
   78,389.74/108,178.64 = 42,580.45/x
3. Step 3: Cross multiply
   78,389.74x = 108,178.64 × 42,580.45
4. Step 4: Simplify right side
   78,389.74x = 4,606,295,171.59
5. Step 5: Solve for x
   x = 4,606,295,171.59/78,389.74
6. Step 6: Final answer
   x = 58,761.45