Finding the Fourth Proportional to 139,131.30, 208,693.47 and 76,012.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,131.30 : 208,693.47 = 76,012.74 : x
2. Step 2: Convert to fraction form
   139,131.30/208,693.47 = 76,012.74/x
3. Step 3: Cross multiply
   139,131.30x = 208,693.47 × 76,012.74
4. Step 4: Simplify right side
   139,131.30x = 15,863,362,474.81
5. Step 5: Solve for x
   x = 15,863,362,474.81/139,131.30
6. Step 6: Final answer
   x = 114,017.21