Finding the Fourth Proportional to 64,879.47, 89,477.73 and 42,210.18

Step by Step Solution

1. Step 1: Write the proportion equation
   64,879.47 : 89,477.73 = 42,210.18 : x
2. Step 2: Convert to fraction form
   64,879.47/89,477.73 = 42,210.18/x
3. Step 3: Cross multiply
   64,879.47x = 89,477.73 × 42,210.18
4. Step 4: Simplify right side
   64,879.47x = 3,776,871,089.29
5. Step 5: Solve for x
   x = 3,776,871,089.29/64,879.47
6. Step 6: Final answer
   x = 58,213.66