Finding the Fourth Proportional to 42,997.64, 64,494.17 and 13,412.08

Step by Step Solution

1. Step 1: Write the proportion equation
   42,997.64 : 64,494.17 = 13,412.08 : x
2. Step 2: Convert to fraction form
   42,997.64/64,494.17 = 13,412.08/x
3. Step 3: Cross multiply
   42,997.64x = 64,494.17 × 13,412.08
4. Step 4: Simplify right side
   42,997.64x = 865,001,106.87
5. Step 5: Solve for x
   x = 865,001,106.87/42,997.64
6. Step 6: Final answer
   x = 20,117.41