Finding the Fourth Proportional to 101,388.86, 139,917.53 and 56,069.89

Step by Step Solution

1. Step 1: Write the proportion equation
   101,388.86 : 139,917.53 = 56,069.89 : x
2. Step 2: Convert to fraction form
   101,388.86/139,917.53 = 56,069.89/x
3. Step 3: Cross multiply
   101,388.86x = 139,917.53 × 56,069.89
4. Step 4: Simplify right side
   101,388.86x = 7,845,160,516.17
5. Step 5: Solve for x
   x = 7,845,160,516.17/101,388.86
6. Step 6: Final answer
   x = 77,376.95