Finding the Fourth Proportional to 76,521.28, 105,570.60 and 56,426.11

Step by Step Solution

1. Step 1: Write the proportion equation
   76,521.28 : 105,570.60 = 56,426.11 : x
2. Step 2: Convert to fraction form
   76,521.28/105,570.60 = 56,426.11/x
3. Step 3: Cross multiply
   76,521.28x = 105,570.60 × 56,426.11
4. Step 4: Simplify right side
   76,521.28x = 5,956,938,288.37
5. Step 5: Solve for x
   x = 5,956,938,288.37/76,521.28
6. Step 6: Final answer
   x = 77,846.82