Finding the Fourth Proportional to 101,131.25, 139,561.19 and 56,419.25

Step by Step Solution

1. Step 1: Write the proportion equation
   101,131.25 : 139,561.19 = 56,419.25 : x
2. Step 2: Convert to fraction form
   101,131.25/139,561.19 = 56,419.25/x
3. Step 3: Cross multiply
   101,131.25x = 139,561.19 × 56,419.25
4. Step 4: Simplify right side
   101,131.25x = 7,873,937,386.81
5. Step 5: Solve for x
   x = 7,873,937,386.81/101,131.25
6. Step 6: Final answer
   x = 77,858.60