Finding the Fourth Proportional to 76,805.34, 105,980.91 and 42,809.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,805.34 : 105,980.91 = 42,809.79 : x
2. Step 2: Convert to fraction form
   76,805.34/105,980.91 = 42,809.79/x
3. Step 3: Cross multiply
   76,805.34x = 105,980.91 × 42,809.79
4. Step 4: Simplify right side
   76,805.34x = 4,537,020,501.11
5. Step 5: Solve for x
   x = 4,537,020,501.11/76,805.34
6. Step 6: Final answer
   x = 59,071.68