Finding the Fourth Proportional to 76,797.80, 105,977.56 and 42,810

Step by Step Solution

1. Step 1: Write the proportion equation
   76,797.80 : 105,977.56 = 42,810 : x
2. Step 2: Convert to fraction form
   76,797.80/105,977.56 = 42,810/x
3. Step 3: Cross multiply
   76,797.80x = 105,977.56 × 42,810
4. Step 4: Simplify right side
   76,797.80x = 4,536,899,343.60
5. Step 5: Solve for x
   x = 4,536,899,343.60/76,797.80
6. Step 6: Final answer
   x = 59,075.90