Finding the Fourth Proportional to 76,797.16, 105,980.59 and 42,807.81

Step by Step Solution

1. Step 1: Write the proportion equation
   76,797.16 : 105,980.59 = 42,807.81 : x
2. Step 2: Convert to fraction form
   76,797.16/105,980.59 = 42,807.81/x
3. Step 3: Cross multiply
   76,797.16x = 105,980.59 × 42,807.81
4. Step 4: Simplify right side
   76,797.16x = 4,536,796,574.41
5. Step 5: Solve for x
   x = 4,536,796,574.41/76,797.16
6. Step 6: Final answer
   x = 59,075.05