Finding the Fourth Proportional to 64,886.12, 89,557.26 and 42,185.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,886.12 : 89,557.26 = 42,185.72 : x
2. Step 2: Convert to fraction form
   64,886.12/89,557.26 = 42,185.72/x
3. Step 3: Cross multiply
   64,886.12x = 89,557.26 × 42,185.72
4. Step 4: Simplify right side
   64,886.12x = 3,778,037,494.33
5. Step 5: Solve for x
   x = 3,778,037,494.33/64,886.12
6. Step 6: Final answer
   x = 58,225.67