Finding the Fourth Proportional to 76,448.70, 105,478.47 and 42,913.98

Step by Step Solution

1. Step 1: Write the proportion equation
   76,448.70 : 105,478.47 = 42,913.98 : x
2. Step 2: Convert to fraction form
   76,448.70/105,478.47 = 42,913.98/x
3. Step 3: Cross multiply
   76,448.70x = 105,478.47 × 42,913.98
4. Step 4: Simplify right side
   76,448.70x = 4,526,500,952.01
5. Step 5: Solve for x
   x = 4,526,500,952.01/76,448.70
6. Step 6: Final answer
   x = 59,209.65