Finding the Fourth Proportional to 101,434.04, 139,978.20 and 56,722.04

Step by Step Solution

1. Step 1: Write the proportion equation
   101,434.04 : 139,978.20 = 56,722.04 : x
2. Step 2: Convert to fraction form
   101,434.04/139,978.20 = 56,722.04/x
3. Step 3: Cross multiply
   101,434.04x = 139,978.20 × 56,722.04
4. Step 4: Simplify right side
   101,434.04x = 7,939,849,059.53
5. Step 5: Solve for x
   x = 7,939,849,059.53/101,434.04
6. Step 6: Final answer
   x = 78,275.98