Finding the Fourth Proportional to 42,099.60, 63,149.71 and 28,911.99

Step by Step Solution

1. Step 1: Write the proportion equation
   42,099.60 : 63,149.71 = 28,911.99 : x
2. Step 2: Convert to fraction form
   42,099.60/63,149.71 = 28,911.99/x
3. Step 3: Cross multiply
   42,099.60x = 63,149.71 × 28,911.99
4. Step 4: Simplify right side
   42,099.60x = 1,825,783,784.02
5. Step 5: Solve for x
   x = 1,825,783,784.02/42,099.60
6. Step 6: Final answer
   x = 43,368.20