Finding the Fourth Proportional to 210,607.98, 315,941.68 and 68,407.72

Step by Step Solution

1. Step 1: Write the proportion equation
   210,607.98 : 315,941.68 = 68,407.72 : x
2. Step 2: Convert to fraction form
   210,607.98/315,941.68 = 68,407.72/x
3. Step 3: Cross multiply
   210,607.98x = 315,941.68 × 68,407.72
4. Step 4: Simplify right side
   210,607.98x = 21,612,849,981.77
5. Step 5: Solve for x
   x = 21,612,849,981.77/210,607.98
6. Step 6: Final answer
   x = 102,621.23