Finding the Fourth Proportional to 78,390.74, 108,180.02 and 42,581.45

Step by Step Solution

1. Step 1: Write the proportion equation
   78,390.74 : 108,180.02 = 42,581.45 : x
2. Step 2: Convert to fraction form
   78,390.74/108,180.02 = 42,581.45/x
3. Step 3: Cross multiply
   78,390.74x = 108,180.02 × 42,581.45
4. Step 4: Simplify right side
   78,390.74x = 4,606,462,112.63
5. Step 5: Solve for x
   x = 4,606,462,112.63/78,390.74
6. Step 6: Final answer
   x = 58,762.83