Finding the Fourth Proportional to 42,858.72, 64,386.90 and 41,087.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,858.72 : 64,386.90 = 41,087.25 : x
2. Step 2: Convert to fraction form
   42,858.72/64,386.90 = 41,087.25/x
3. Step 3: Cross multiply
   42,858.72x = 64,386.90 × 41,087.25
4. Step 4: Simplify right side
   42,858.72x = 2,645,480,657.03
5. Step 5: Solve for x
   x = 2,645,480,657.03/42,858.72
6. Step 6: Final answer
   x = 61,725.61