Finding the Fourth Proportional to 76,680.42, 105,812.91 and 42,686.34

Step by Step Solution

1. Step 1: Write the proportion equation
   76,680.42 : 105,812.91 = 42,686.34 : x
2. Step 2: Convert to fraction form
   76,680.42/105,812.91 = 42,686.34/x
3. Step 3: Cross multiply
   76,680.42x = 105,812.91 × 42,686.34
4. Step 4: Simplify right side
   76,680.42x = 4,516,765,852.65
5. Step 5: Solve for x
   x = 4,516,765,852.65/76,680.42
6. Step 6: Final answer
   x = 58,903.77