Finding the Fourth Proportional to 101,100, 139,518 and 56,388

Step by Step Solution

1. Step 1: Write the proportion equation
   101,100 : 139,518 = 56,388 : x
2. Step 2: Convert to fraction form
   101,100/139,518 = 56,388/x
3. Step 3: Cross multiply
   101,100x = 139,518 × 56,388
4. Step 4: Simplify right side
   101,100x = 7,867,140,984
5. Step 5: Solve for x
   x = 7,867,140,984/101,100
6. Step 6: Final answer
   x = 77,815.44