Finding the Fourth Proportional to 64,742.13, 89,323.29 and 39,258.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,742.13 : 89,323.29 = 39,258.72 : x
2. Step 2: Convert to fraction form
   64,742.13/89,323.29 = 39,258.72/x
3. Step 3: Cross multiply
   64,742.13x = 89,323.29 × 39,258.72
4. Step 4: Simplify right side
   64,742.13x = 3,506,718,031.59
5. Step 5: Solve for x
   x = 3,506,718,031.59/64,742.13
6. Step 6: Final answer
   x = 54,164.39