Finding the Fourth Proportional to 45,538.28, 67,849.55 and 42,991.79

Step by Step Solution

1. Step 1: Write the proportion equation
   45,538.28 : 67,849.55 = 42,991.79 : x
2. Step 2: Convert to fraction form
   45,538.28/67,849.55 = 42,991.79/x
3. Step 3: Cross multiply
   45,538.28x = 67,849.55 × 42,991.79
4. Step 4: Simplify right side
   45,538.28x = 2,916,973,373.43
5. Step 5: Solve for x
   x = 2,916,973,373.43/45,538.28
6. Step 6: Final answer
   x = 64,055.42