Finding the Fourth Proportional to 42,860.36, 64,300.80 and 17,886.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,860.36 : 64,300.80 = 17,886.50 : x
2. Step 2: Convert to fraction form
   42,860.36/64,300.80 = 17,886.50/x
3. Step 3: Cross multiply
   42,860.36x = 64,300.80 × 17,886.50
4. Step 4: Simplify right side
   42,860.36x = 1,150,116,259.20
5. Step 5: Solve for x
   x = 1,150,116,259.20/42,860.36
6. Step 6: Final answer
   x = 26,834.03