Finding the Fourth Proportional to 101,699.51, 140,345.33 and 56,987.51

Step by Step Solution

1. Step 1: Write the proportion equation
   101,699.51 : 140,345.33 = 56,987.51 : x
2. Step 2: Convert to fraction form
   101,699.51/140,345.33 = 56,987.51/x
3. Step 3: Cross multiply
   101,699.51x = 140,345.33 × 56,987.51
4. Step 4: Simplify right side
   101,699.51x = 7,997,929,910.16
5. Step 5: Solve for x
   x = 7,997,929,910.16/101,699.51
6. Step 6: Final answer
   x = 78,642.76