Finding the Fourth Proportional to 78,509.51, 108,340.00 and 42,699.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,509.51 : 108,340.00 = 42,699.50 : x
2. Step 2: Convert to fraction form
   78,509.51/108,340.00 = 42,699.50/x
3. Step 3: Cross multiply
   78,509.51x = 108,340.00 × 42,699.50
4. Step 4: Simplify right side
   78,509.51x = 4,626,063,181.55
5. Step 5: Solve for x
   x = 4,626,063,181.55/78,509.51
6. Step 6: Final answer
   x = 58,923.61