Finding the Fourth Proportional to 42,870.53, 64,274.65 and 17,917.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.53 : 64,274.65 = 17,917.71 : x
2. Step 2: Convert to fraction form
   42,870.53/64,274.65 = 17,917.71/x
3. Step 3: Cross multiply
   42,870.53x = 64,274.65 × 17,917.71
4. Step 4: Simplify right side
   42,870.53x = 1,151,654,253.23
5. Step 5: Solve for x
   x = 1,151,654,253.23/42,870.53
6. Step 6: Final answer
   x = 26,863.54