Finding the Fourth Proportional to 61,128,003.20, 91,692,005.16 and 61,128,003.20

Step by Step Solution

1. Step 1: Write the proportion equation
   61,128,003.20 : 91,692,005.16 = 61,128,003.20 : x
2. Step 2: Convert to fraction form
   61,128,003.20/91,692,005.16 = 61,128,003.20/x
3. Step 3: Cross multiply
   61,128,003.20x = 91,692,005.16 × 61,128,003.20
4. Step 4: Simplify right side
   61,128,003.20x = 5,604,949,184,834,897
5. Step 5: Solve for x
   x = 5,604,949,184,834,897/61,128,003.20
6. Step 6: Final answer
   x = 91,692,005.16