Finding the Fourth Proportional to 76,790.06, 105,978.90 and 42,801.65

Step by Step Solution

1. Step 1: Write the proportion equation
   76,790.06 : 105,978.90 = 42,801.65 : x
2. Step 2: Convert to fraction form
   76,790.06/105,978.90 = 42,801.65/x
3. Step 3: Cross multiply
   76,790.06x = 105,978.90 × 42,801.65
4. Step 4: Simplify right side
   76,790.06x = 4,536,071,255.29
5. Step 5: Solve for x
   x = 4,536,071,255.29/76,790.06
6. Step 6: Final answer
   x = 59,071.08