Finding the Fourth Proportional to 42,887.05, 64,308.63 and 17,920.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,887.05 : 64,308.63 = 17,920.28 : x
2. Step 2: Convert to fraction form
   42,887.05/64,308.63 = 17,920.28/x
3. Step 3: Cross multiply
   42,887.05x = 64,308.63 × 17,920.28
4. Step 4: Simplify right side
   42,887.05x = 1,152,428,656.02
5. Step 5: Solve for x
   x = 1,152,428,656.02/42,887.05
6. Step 6: Final answer
   x = 26,871.25