Finding the Fourth Proportional to 139,777.59, 209,644.89 and 76,629

Step by Step Solution

1. Step 1: Write the proportion equation
   139,777.59 : 209,644.89 = 76,629 : x
2. Step 2: Convert to fraction form
   139,777.59/209,644.89 = 76,629/x
3. Step 3: Cross multiply
   139,777.59x = 209,644.89 × 76,629
4. Step 4: Simplify right side
   139,777.59x = 16,064,878,275.81
5. Step 5: Solve for x
   x = 16,064,878,275.81/139,777.59
6. Step 6: Final answer
   x = 114,931.72