Finding the Fourth Proportional to 101,215, 139,676.71 and 56,503

Step by Step Solution

1. Step 1: Write the proportion equation
   101,215 : 139,676.71 = 56,503 : x
2. Step 2: Convert to fraction form
   101,215/139,676.71 = 56,503/x
3. Step 3: Cross multiply
   101,215x = 139,676.71 × 56,503
4. Step 4: Simplify right side
   101,215x = 7,892,153,145.13
5. Step 5: Solve for x
   x = 7,892,153,145.13/101,215
6. Step 6: Final answer
   x = 77,974.15