Finding the Fourth Proportional to 78,390.05, 108,179.25 and 42,580.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,390.05 : 108,179.25 = 42,580.65 : x
2. Step 2: Convert to fraction form
   78,390.05/108,179.25 = 42,580.65/x
3. Step 3: Cross multiply
   78,390.05x = 108,179.25 × 42,580.65
4. Step 4: Simplify right side
   78,390.05x = 4,606,343,027.51
5. Step 5: Solve for x
   x = 4,606,343,027.51/78,390.05
6. Step 6: Final answer
   x = 58,761.84