Finding the Fourth Proportional to 101,142, 139,575.96 and 56,430

Step by Step Solution

1. Step 1: Write the proportion equation
   101,142 : 139,575.96 = 56,430 : x
2. Step 2: Convert to fraction form
   101,142/139,575.96 = 56,430/x
3. Step 3: Cross multiply
   101,142x = 139,575.96 × 56,430
4. Step 4: Simplify right side
   101,142x = 7,876,271,422.80
5. Step 5: Solve for x
   x = 7,876,271,422.80/101,142
6. Step 6: Final answer
   x = 77,873.40