Finding the Fourth Proportional to 42,874.16, 64,308.78 and 13,291.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,874.16 : 64,308.78 = 13,291.07 : x
2. Step 2: Convert to fraction form
   42,874.16/64,308.78 = 13,291.07/x
3. Step 3: Cross multiply
   42,874.16x = 64,308.78 × 13,291.07
4. Step 4: Simplify right side
   42,874.16x = 854,732,175.05
5. Step 5: Solve for x
   x = 854,732,175.05/42,874.16
6. Step 6: Final answer
   x = 19,935.84