Finding the Fourth Proportional to 42,988.60, 64,389.41 and 26,298.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,988.60 : 64,389.41 = 26,298.15 : x
2. Step 2: Convert to fraction form
   42,988.60/64,389.41 = 26,298.15/x
3. Step 3: Cross multiply
   42,988.60x = 64,389.41 × 26,298.15
4. Step 4: Simplify right side
   42,988.60x = 1,693,322,362.59
5. Step 5: Solve for x
   x = 1,693,322,362.59/42,988.60
6. Step 6: Final answer
   x = 39,390.03