Finding the Fourth Proportional to 139,117.30, 208,727.15 and 56,019.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,117.30 : 208,727.15 = 56,019.70 : x
2. Step 2: Convert to fraction form
   139,117.30/208,727.15 = 56,019.70/x
3. Step 3: Cross multiply
   139,117.30x = 208,727.15 × 56,019.70
4. Step 4: Simplify right side
   139,117.30x = 11,692,832,324.86
5. Step 5: Solve for x
   x = 11,692,832,324.86/139,117.30
6. Step 6: Final answer
   x = 84,050.17