Finding the Fourth Proportional to 42,994.58, 64,415.60 and 17,979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,994.58 : 64,415.60 = 17,979.50 : x
2. Step 2: Convert to fraction form
   42,994.58/64,415.60 = 17,979.50/x
3. Step 3: Cross multiply
   42,994.58x = 64,415.60 × 17,979.50
4. Step 4: Simplify right side
   42,994.58x = 1,158,160,280.20
5. Step 5: Solve for x
   x = 1,158,160,280.20/42,994.58
6. Step 6: Final answer
   x = 26,937.36