Finding the Fourth Proportional to 76,824.72, 105,999.84 and 43,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,824.72 : 105,999.84 = 43,290.72 : x
2. Step 2: Convert to fraction form
   76,824.72/105,999.84 = 43,290.72/x
3. Step 3: Cross multiply
   76,824.72x = 105,999.84 × 43,290.72
4. Step 4: Simplify right side
   76,824.72x = 4,588,809,393.48
5. Step 5: Solve for x
   x = 4,588,809,393.48/76,824.72
6. Step 6: Final answer
   x = 59,730.90