Finding the Fourth Proportional to 101,399.88, 139,919.56 and 56,071.76

Step by Step Solution

1. Step 1: Write the proportion equation
   101,399.88 : 139,919.56 = 56,071.76 : x
2. Step 2: Convert to fraction form
   101,399.88/139,919.56 = 56,071.76/x
3. Step 3: Cross multiply
   101,399.88x = 139,919.56 × 56,071.76
4. Step 4: Simplify right side
   101,399.88x = 7,845,535,987.63
5. Step 5: Solve for x
   x = 7,845,535,987.63/101,399.88
6. Step 6: Final answer
   x = 77,372.24