Finding the Fourth Proportional to 100,897, 139,242.18 and 56,185

Step by Step Solution

1. Step 1: Write the proportion equation
   100,897 : 139,242.18 = 56,185 : x
2. Step 2: Convert to fraction form
   100,897/139,242.18 = 56,185/x
3. Step 3: Cross multiply
   100,897x = 139,242.18 × 56,185
4. Step 4: Simplify right side
   100,897x = 7,823,321,883.30
5. Step 5: Solve for x
   x = 7,823,321,883.30/100,897
6. Step 6: Final answer
   x = 77,537.71