Finding the Fourth Proportional to 101,811.74, 140,507.91 and 56,498.30

Step by Step Solution

1. Step 1: Write the proportion equation
   101,811.74 : 140,507.91 = 56,498.30 : x
2. Step 2: Convert to fraction form
   101,811.74/140,507.91 = 56,498.30/x
3. Step 3: Cross multiply
   101,811.74x = 140,507.91 × 56,498.30
4. Step 4: Simplify right side
   101,811.74x = 7,938,457,066.52
5. Step 5: Solve for x
   x = 7,938,457,066.52/101,811.74
6. Step 6: Final answer
   x = 77,971.92