Finding the Fourth Proportional to 42,888.99, 64,355.72 and 28,667.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,888.99 : 64,355.72 = 28,667.42 : x
2. Step 2: Convert to fraction form
   42,888.99/64,355.72 = 28,667.42/x
3. Step 3: Cross multiply
   42,888.99x = 64,355.72 × 28,667.42
4. Step 4: Simplify right side
   42,888.99x = 1,844,912,230.86
5. Step 5: Solve for x
   x = 1,844,912,230.86/42,888.99
6. Step 6: Final answer
   x = 43,015.98