Finding the Fourth Proportional to 76,731.62, 105,889.28 and 42,740.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,731.62 : 105,889.28 = 42,740.50 : x
2. Step 2: Convert to fraction form
   76,731.62/105,889.28 = 42,740.50/x
3. Step 3: Cross multiply
   76,731.62x = 105,889.28 × 42,740.50
4. Step 4: Simplify right side
   76,731.62x = 4,525,760,771.84
5. Step 5: Solve for x
   x = 4,525,760,771.84/76,731.62
6. Step 6: Final answer
   x = 58,981.69