Finding the Fourth Proportional to 76,487.28, 105,494.04 and 55,336.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,487.28 : 105,494.04 = 55,336.56 : x
2. Step 2: Convert to fraction form
   76,487.28/105,494.04 = 55,336.56/x
3. Step 3: Cross multiply
   76,487.28x = 105,494.04 × 55,336.56
4. Step 4: Simplify right side
   76,487.28x = 5,837,677,274.10
5. Step 5: Solve for x
   x = 5,837,677,274.10/76,487.28
6. Step 6: Final answer
   x = 76,322.20