Finding the Fourth Proportional to 79,997.28, 120,068.55 and 42,588.60

Step by Step Solution

1. Step 1: Write the proportion equation
   79,997.28 : 120,068.55 = 42,588.60 : x
2. Step 2: Convert to fraction form
   79,997.28/120,068.55 = 42,588.60/x
3. Step 3: Cross multiply
   79,997.28x = 120,068.55 × 42,588.60
4. Step 4: Simplify right side
   79,997.28x = 5,113,551,448.53
5. Step 5: Solve for x
   x = 5,113,551,448.53/79,997.28
6. Step 6: Final answer
   x = 63,921.57