Finding the Fourth Proportional to 101,397.69, 139,926.29 and 56,078.19

Step by Step Solution

1. Step 1: Write the proportion equation
   101,397.69 : 139,926.29 = 56,078.19 : x
2. Step 2: Convert to fraction form
   101,397.69/139,926.29 = 56,078.19/x
3. Step 3: Cross multiply
   101,397.69x = 139,926.29 × 56,078.19
4. Step 4: Simplify right side
   101,397.69x = 7,846,812,796.22
5. Step 5: Solve for x
   x = 7,846,812,796.22/101,397.69
6. Step 6: Final answer
   x = 77,386.50