Finding the Fourth Proportional to 102,462.98, 141,509.18 and 78,003

Step by Step Solution

1. Step 1: Write the proportion equation
   102,462.98 : 141,509.18 = 78,003 : x
2. Step 2: Convert to fraction form
   102,462.98/141,509.18 = 78,003/x
3. Step 3: Cross multiply
   102,462.98x = 141,509.18 × 78,003
4. Step 4: Simplify right side
   102,462.98x = 11,038,140,323.78
5. Step 5: Solve for x
   x = 11,038,140,323.78/102,462.98
6. Step 6: Final answer
   x = 107,728.09