Finding the Fourth Proportional to 65,009.79, 89,680.26 and 42,386.69

Step by Step Solution

1. Step 1: Write the proportion equation
   65,009.79 : 89,680.26 = 42,386.69 : x
2. Step 2: Convert to fraction form
   65,009.79/89,680.26 = 42,386.69/x
3. Step 3: Cross multiply
   65,009.79x = 89,680.26 × 42,386.69
4. Step 4: Simplify right side
   65,009.79x = 3,801,249,762.89
5. Step 5: Solve for x
   x = 3,801,249,762.89/65,009.79
6. Step 6: Final answer
   x = 58,471.96